Indicator for cure of two-component-epoxy adhesives

Cold-curing two-component-epoxy adhesive, comprising

• (a) an epoxy-resin-component and
• (b) a curing agent-component, comprising a mercaptan curing agent,
• in which the epoxy-resin-component comprises a color change indicator, wherein said cold-curing two-component-epoxy adhesive is capable of curing at a temperature as low as 0° C.;
• and wherein the color change indicator is selected from the group consisting of Solvent Red 26 {1-[[2,5-dimethyl-4-[(2-methylphenyl)azo]-phenyl]azo]-2-naphthol}, Solvent Red 164 {1-[[4-[phenylazo]-phenyl]azo]-2-naphthol} and combinations thereof.

Cold-curing two-component-epoxy adhesive comprising

• (a) an epoxy-resin-component, comprising:
• (i) at least one polyepoxide, in an amount between 50-80 wt. %,
• (ii) at least one filler, in an amount between of 20-50 wt. %,
• (iii) a color change indicator selected from the group consisting of Solvent Red 26 {1-[[2,5-dimethyl-4-[(2-methylphenyl)azo]-phenyl]azo]-2-naphthol }, Solvent Red 164 {1-[[4-[phenylazo]-phenyl]azo]-2-naphthol} and combinations thereof, in an amount between 0.05% to 5.0% wt. %, said amounts being based on the total weight of the epoxy-resin-component, and
• (b) a curing agent-component, comprising:
• (i) a mercaptan epoxy hardener in amounts of 40-80 wt. %,
• (ii) a tertiary amine, in amounts of 0.1-20 wt. %,
• (iii) at least one filler, in amounts of 20-50 wt. %, said amounts based on the total weight of the curing agent-component.

Cold-curing two-component-epoxy adhesive comprising

• (a) an epoxy-resin-component, comprising:
• (i) a polyepoxide selected from the group consisting of Bisphenol F diglycidyl ether (BFDGE) and Bisphenol A diglycidyl ether (BADGE), in an amount between 50-80 wt. %,
• (ii) quartz powder, in an amount between 20-50 wt. %,
• (iii) a color change indicator selected from the group consisting of Solvent Red 26 {1-[[2,5-dimethyl-4-[(2-methylphenyl)azo]-phenyl]azo]-2-naphthol }, Solvent Red 164 {1-[[4-[phenylazo]-phenyl]azo]-2-naphthol} and combinations thereof, in an amount between 0.05% to 5.0% wt. %, said amounts are based on the total weight of the epoxy-resin-component, and
• (b) curing agent-component, comprising:
• (i) a mercaptan epoxy hardener in an amount between 40-80wt. %,
• (ii) Tris(dimethylaminomethyl)phenol, in an amount between 0.1-20 wt. %,
• (iii) quartz powder, in an amount between of 20-50 wt. %, said amounts based on the total weight of the curing agent-component.